NANOG Traceroute

Ehud Gavron maintains this version of traceroute. It is derived from the original traceroute program, but adds a few features such as AS (Autonomous System) number lookup, and detection of TOS (Type-of-Service) changes along the path.

TOS Change Detection

This feature can be used to check whether a network path is DSCP-transparent. Use the -t option to select the TOS byte, and watch out for TOS byte changes indicated with TOS=x!.

As shown in the following example, GEANT2 accepts TOS=32/DSCP=8/CLS=1 - this corresponds to "LBE"